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|
#------------------------------------------------------------------------------
# File: MISB.pm
#
# Description: Read Motion Industry Standards Board metadata
#
# Revisions: 2022/10/08 - P. Harvey Created
#
# References: 1) https://dokumen.tips/documents/nato-standardization-agreement-stanag-4609-ed-3.html
# 2) https://upload.wikimedia.org/wikipedia/commons/1/19/MISB_Standard_0601.pdf
# 3) https://dokumen.tips/documents/misb-st-010211-standard-security-metadata-universal-standard-describes-the-use.html
#------------------------------------------------------------------------------
package Image::ExifTool::MISB;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.00';
sub ProcessKLV($$$);
my %timeInfo = (
Groups => { 2 => 'Time' },
Format => 'int64u',
ValueConv => 'ConvertUnixTime($val/1e6, 0, 6) . "Z"',
PrintConv => '$self->ConvertDateTime($val)',
);
my %latInfo = (
Format => 'int32s',
ValueConv => '$val * 90 / 0x7fffffff',
PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "N")',
);
my %lonInfo = (
Format => 'int32s',
ValueConv => '$val * 180 / 0x7fffffff',
PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "E")',
);
my %altInfo = (
Format => 'int16u',
ValueConv => '$val * 19900 / 0xffff - 900',
PrintConv => 'sprintf("%.2f m", $val)',
);
# default format based on size of unknown KLV information
my %defaultFormat = (
1 => 'int8u',
2 => 'int16u',
4 => 'int32u',
8 => 'int64u',
);
%Image::ExifTool::MISB::Main = (
GROUPS => { 0 => 'MISB', 1 => 'MISB', 2 => 'Other' },
VARS => { LONG_TAGS => 2 },
NOTES => q{
These tags are extracted from STANAG-4609 MISB (Motion Industry Standards
Board) KLV-format metadata in M2TS videos.
},
'060e2b34020b01010e01030101000000' => {
Name => 'UASDataLink',
SubDirectory => { TagTable => 'Image::ExifTool::MISB::UASDatalink' },
},
'060e2b3402030101434e415644494147' => { # "CNAVDIAG" written by ChurchillNavigation ION
Name => 'ChurchillNav',
SubDirectory => {
TagTable => 'Image::ExifTool::MISB::ChurchillNav',
ByteOrder => 'LittleEndian', # !!
},
},
'060E2B34030101010E01030302000000' => { # (NC)
Name => 'Security',
SubDirectory => { TagTable => 'Image::ExifTool::MISB::Security' },
},
'<other>' => {
Name => 'Unknown',
SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' },
},
);
# UAS datalink local set tags (ref 2, MISB ST 0601.11)
%Image::ExifTool::MISB::UASDatalink = (
GROUPS => { 0 => 'MISB', 1 => 'MISB', 2 => 'Location' },
PROCESS_PROC => \&ProcessKLV,
NOTES => 'Tags extracted from the MISB ST 0601.11 UAS Datalink local set.',
1 => { Name => 'Checksum', Format => 'int16u' },
2 => { Name => 'GPSDateTime', %timeInfo },
3 => { Name => 'MissionID', Format => 'string' },
4 => { Name => 'TailNumber', Format => 'string' },
5 => { Name => 'GPSTrack', Format => 'int16u', ValueConv => '$val * 360 / 0xffff' },
6 => { Name => 'PitchAngle', Format => 'int16s', ValueConv => '$val * 20 / 0x7fff' },
7 => { Name => 'RollAngle', Format => 'int16s', ValueConv => '$val * 50 / 0x7fff' },
8 => { Name => 'TrueAirspeed', Format => 'int8u', PrintConv => '"$val m/s"' },
9 => { Name => 'IndicatedAirspeed', Format => 'int8u', PrintConv => '"$val m/s"' },
10 => { Name => 'ProjectIDCode', Format => 'string' },
11 => { Name => 'SensorName', Format => 'string' },
12 => { Name => 'ImageCoordinateSystem', Format => 'string' },
13 => { Name => 'GPSLatitude', %latInfo },
14 => { Name => 'GPSLongitude', %lonInfo },
15 => { Name => 'GPSAltitude', %altInfo },
16 => { Name => 'HorizontalFieldOfView', Format => 'int16u', ValueConv => '$val * 180 / 0xffff' },
17 => { Name => 'VerticalFieldOfView', Format => 'int16u', ValueConv => '$val * 180 / 0xffff' },
18 => { Name => 'SensorRelativeAzimuthAngle',Format=> 'int32u', ValueConv => '$val * 360 / 0xffffffff' },
19 => { Name => 'SensorRelativeElevationAngle',Format=>'int32s',ValueConv => '$val * 180 / 0x7fffffff' },
20 => { Name => 'SensorRelativeRollAngle', Format => 'int32u', ValueConv => '$val * 360 / 0xffffffff' },
21 => { Name => 'SlantRange', Format => 'int32u', ValueConv => '$val * 5000000 / 0xffffffff' },
22 => { Name => 'TargetWidth', Format => 'int16u', ValueConv => '$val * 10000 / 0xffff' },
23 => { Name => 'FrameCenterLatitude', %latInfo },
24 => { Name => 'FrameCenterLongitude', %lonInfo },
25 => { Name => 'FrameCenterElevation', %altInfo },
26 => { Name => 'OffsetCornerLatitude1', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
27 => { Name => 'OffsetCornerLongitude1', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
28 => { Name => 'OffsetCornerLatitude2', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
29 => { Name => 'OffsetCornerLongitude2', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
30 => { Name => 'OffsetCornerLatitude3', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
31 => { Name => 'OffsetCornerLongitude3', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
32 => { Name => 'OffsetCornerLatitude4', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
33 => { Name => 'OffsetCornerLongitude4', Format => 'int16s', ValueConv => '$val * .075 / 0x7fff' },
34 => { Name => 'IcingDetected', Format => 'int8u', PrintConv => { 0 => 'n/a', 1 => 'No', 2 => 'Yes' } },
35 => { Name => 'WindDirection', Format => 'int16u', ValueConv => '$val * 360 / 0xffff' },
36 => { Name => 'WindSpeed', Format => 'int8u', ValueConv => '$val * 100 / 0xff', Notes => 'm/s' },
37 => { Name => 'StaticPressure', Format => 'int16u', ValueConv => '$val * 5000 / 0xffff', Notes => 'mbar' },
38 => { Name => 'DensityAltitude', Format => 'int16u', ValueConv => '$val * 19900 / 0xffff - 900' },
39 => { Name => 'AirTemperature', Format => 'int8s' },
40 => { Name => 'TargetLocationLatitude', %latInfo },
41 => { Name => 'TargetLocationLongitude', %lonInfo },
42 => { Name => 'TargetLocationElevation', %altInfo },
43 => { Name => 'TargetTrackGateWidth', Format => 'int8u' },
44 => { Name => 'TargetTrackGateHeight', Format => 'int8u' },
45 => { Name => 'TargetErrorEstimateCE90', Format => 'int16u' },
46 => { Name => 'TargetErrorEstimateLE90', Format => 'int16u' },
47 => { Name => 'GenericFlagData01',
Format => 'int8u',
PrintConv => { BITMASK => {
0 => 'Laser range',
1 => 'Auto-track',
2 => 'IR polarity black',
3 => 'Icing detected',
4 => 'Slant range measured',
5 => 'Image invalid',
}},
},
48 => { Name => 'SecurityLocalMetadataSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Security' } },
49 => { Name => 'DifferentialPressure', Format => 'int16u', ValueConv => '$val * 5000 / 0xffff' },
50 => { Name => 'AngleOfAttack', Format => 'int16s', ValueConv => '$val * 20 / 0x7fff' },
51 => { Name => 'VerticalSpeed', Format => 'int16s', ValueConv => '$val * 180 / 0x7fff', Notes => 'm/s' },
52 => { Name => 'SideslipAngle', Format => 'int16s', ValueConv => '$val * 20 / 0x7fff' },
53 => { Name => 'AirfieldBarometricPressure',Format=> 'int16u', ValueConv => '$val * 5000 / 0xffff' },
54 => { Name => 'AirfieldElevation', %altInfo },
55 => { Name => 'RelativeHumidity', Format => 'int8u', ValueConv => '$val * 100 / 0xff' },
56 => { Name => 'GPSSpeed', Format => 'int8u', Notes => 'm/s' },
57 => { Name => 'GroundRange', Format => 'int32u', ValueConv => '$val * 5000000 / 0xffffffff' },
58 => { Name => 'FuelRemaining', Format => 'int16u', ValueConv => '$val * 10000 / 0xffff', Notes => 'kg' },
59 => { Name => 'CallSign', Format => 'string' },
60 => { Name => 'WeaponLoad', Format => 'int16u', PrintConv => 'sprintf("0x%.4x",$val)' },
61 => { Name => 'WeaponFired', Format => 'int8u', PrintConv => 'sprintf("0x%.2x",$val)' },
62 => { Name => 'LaserPRFCode', Format => 'int16u' },
63 => { Name => 'SensorFieldOfViewName', Format => 'int8u',
PrintConv => {
0 => 'Ultranarrow',
1 => 'Narrow',
2 => 'Medium',
3 => 'Wide',
4 => 'Ultrawide',
5 => 'Narrow Medium',
6 => '2x Ultranarrow',
7 => '4x Ultranarrow',
},
},
64 => { Name => 'MagneticHeading', Format => 'int16u', ValueConv => '$val * 360 / 0xffff' },
65 => { Name => 'UAS_LSVersionNumber', Format => 'int8u' },
66 => { Name => 'TargetLocationCovarianceMatrix', Format => 'undef', ValueConv => '\$val' },
67 => { Name => 'AlternateLatitude', %latInfo },
68 => { Name => 'AlternateLongitude', %lonInfo },
69 => { Name => 'AlternateAltitude', %altInfo },
70 => { Name => 'AlternateName', Format => 'string' },
71 => { Name => 'AlternateHeading', Format => 'int16u', ValueConv => '$val * 360 / 0xffff' },
72 => { Name => 'EventStartTime', %timeInfo },
73 => { Name => 'RVTLocalSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
74 => { Name => 'VMTIDataSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
75 => { Name => 'SensorEllipsoidHeight', %altInfo },
76 => { Name => 'AlternateEllipsoidHeight', %altInfo },
77 => { Name => 'OperationalMode', Format => 'int8u',
PrintConv => {
0 => 'Other',
1 => 'Operational',
2 => 'Training',
3 => 'Exercise',
4 => 'Maintenance',
},
},
78 => { Name => 'FrameCenterHeightAboveEllipsoid', %altInfo },
79 => { Name => 'SensorVelocityNorth', Format => 'int16s', ValueConv => '$val * 327 / 0x7fff' },
80 => { Name => 'SensorVelocityEast', Format => 'int16s', ValueConv => '$val * 327 / 0x7fff' },
81 => { Name => 'ImageHorizonPixelPack', Format => 'undef', ValueConv => '\$val' },
82 => { Name => 'CornerLatitude1', %latInfo },
83 => { Name => 'CornerLongitude1', %lonInfo },
84 => { Name => 'CornerLatitude2', %latInfo },
85 => { Name => 'CornerLongitude2', %lonInfo },
86 => { Name => 'CornerLatitude3', %latInfo },
87 => { Name => 'CornerLongitude3', %lonInfo },
88 => { Name => 'CornerLatitude4', %latInfo },
89 => { Name => 'CornerLongitude4', %lonInfo },
90 => { Name => 'FullPitchAngle', Format => 'int32s', ValueConv => '$val * 90 / 0x7fffffff' },
91 => { Name => 'FullRollAngle', Format => 'int32s', ValueConv => '$val * 90 / 0x7fffffff' },
92 => { Name => 'FullAngleOfAttack', Format => 'int32s', ValueConv => '$val * 90 / 0x7fffffff' },
93 => { Name => 'FullSideslipAngle', Format => 'int32s', ValueConv => '$val * 90 / 0x7fffffff' },
94 => { Name => 'MIISCoreIdentifier', Format => 'undef', ValueConv => '\$val' },
95 => { Name => 'SARMotionImageryData', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
96 => { Name => 'TargetWidthExtended', Format => 'undef', ValueConv => '\$val' }, # IMAPB format
97 => { Name => 'RangeImageLocalSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
98 => { Name => 'GeoregistrationLocalSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
99 => { Name => 'CompositeImagingLocalSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
100=> { Name => 'SegmentLocalSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
101=> { Name => 'AmendLocalSet', SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } },
102=> { Name => 'SDCC-FLP', Format => 'undef', ValueConv => '\$val' }, # IMAPB format
103=> { Name => 'DensityAltitudeExtended', Format => 'undef', ValueConv => '\$val' }, # IMAPB format
104=> { Name => 'SensorEllipsoidHeightExtended', Format => 'undef', ValueConv => '\$val' }, # IMAPB format
105=> { Name => 'AlternateEllipsoidHeightExtended', Format => 'undef', ValueConv => '\$val' }, # IMAPB format
);
# tags from MISB ST 0102.11 local set
%Image::ExifTool::MISB::Security = (
GROUPS => { 0 => 'MISB', 1 => 'MISB', 2 => 'Document' },
PROCESS_PROC => \&ProcessKLV,
NOTES => 'Tags extracted from the MISB ST 0102.11 Security Metadata local set.',
1 => { Name => 'SecurityClassification', PrintConv => {
1 => 'Unclassified',
2 => 'Restricted',
3 => 'Confidential',
4 => 'Secret',
5 => 'Top Secret',
}},
2 => { Name => 'ClassifyingCountryCodeMethod', PrintConv => {
0x01 => 'ISO-3166 Two Letter',
0x02 => 'ISO-3166 Three Letter',
0x03 => 'FIPS 10-4 Two Letter',
0x04 => 'FIPS 10-4 Four Letter',
0x05 => 'ISO-3166 Numeric',
0x06 => '1059 Two Letter',
0x07 => '1059 Three Letter',
0x0a => 'FIPS 10-4 Mixed',
0x0b => 'ISO 3166 Mixed',
0x0c => 'STANAG 1059 Mixed',
0x0d => 'GENC Two Letter',
0x0e => 'GENC Three Letter',
0x0f => 'GENC Numeric',
0x10 => 'GENC Mixed',
}},
3 => { Name => 'ClassifyingCountry', Format => 'string', PrintConv => '$val =~ s(^//)(); $val' },
4 => 'SecuritySCI-SHIInformation',
5 => { Name => 'Caveats', Format => 'string' },
6 => { Name => 'ReleasingInstructions',Format => 'string' },
7 => { Name => 'ClassifiedBy', Format => 'string' },
8 => { Name => 'DerivedFrom', Format => 'string' },
9 => { Name => 'ClassificationReason', Format => 'string' },
10 => {
Name => 'DeclassificationDate',
Format => 'string',
Groups => { 2 => 'Time' },
ValueConv => '$val =~ s/(\d{4})(\d{2})(\d{2})/$1:$2:$3/; $val',
},
11 => 'ClassificationAndMarkingSystem',
12 => { Name => 'ObjectCountryCodingMethod', PrintConv => {
0x01 => 'ISO-3166 Two Letter',
0x02 => 'ISO-3166 Three Letter',
0x03 => 'ISO-3166 Numeric',
0x04 => 'FIPS 10-4 Two Letter',
0x05 => 'FIPS 10-4 Four Letter',
0x06 => '1059 Two Letter',
0x07 => '1059 Three Letter',
0x0d => 'GENC Two Letter',
0x0e => 'GENC Three Letter',
0x0f => 'GENC Numeric',
0x40 => 'GENC AdminSub',
}},
13 => { Name => 'ObjectCountryCodes', Format => 'string', PrintConv => '$val =~ s(^//)(); $val' },
14 => { Name => 'ClassificationComments', Format => 'string' },
15 => 'UMID',
16 => 'StreamID',
17 => 'TransportStreamID',
21 => 'ItemDesignatorID',
22 => { Name => 'SecurityVersion', Format => 'int16u', PrintConv => '"0102.$val"' },
23 => {
Name => 'ClassifyingCountryCodingMethodDate',
Groups => { 2 => 'Time' },
Format => 'string',
ValueConv => '$val=~tr/-/:/; $val',
},
24 => {
Name => 'ObjectCountryCodingMethodDate',
Groups => { 2 => 'Time' },
Format => 'string',
ValueConv => '$val=~tr/-/:/; $val',
},
);
# I have seen these, but don't know what they are for - PH
# (they look interesting, but remain static through my sample video)
%Image::ExifTool::MISB::ChurchillNav = (
GROUPS => { 0 => 'MISB', 1 => 'MISB', 2 => 'Other' },
PROCESS_PROC => \&ProcessKLV,
TAG_PREFIX => 'ChurchillNav',
NOTES => q{
Proprietary tags used by Churchill Navigation units. These tags are all
currently unknown, but extracted with the Unknown option.
},
# Note: tag ID's are decimal (because the MISB specification uses decimal ID's)
1 => { Name => 'ChurchillNav_0x0001', Format => 'double', Unknown => 1, Hidden => 1 },
2 => { Name => 'ChurchillNav_0x0002', Format => 'double', Unknown => 1, Hidden => 1 },
3 => { Name => 'ChurchillNav_0x0003', Format => 'double', Unknown => 1, Hidden => 1 },
4 => { Name => 'ChurchillNav_0x0004', Format => 'double', Unknown => 1, Hidden => 1 },
5 => { Name => 'ChurchillNav_0x0005', Format => 'double', Unknown => 1, Hidden => 1 },
6 => { Name => 'ChurchillNav_0x0006', Format => 'double', Unknown => 1, Hidden => 1 },
9 => { Name => 'ChurchillNav_0x0009', Format => 'double', Unknown => 1, Hidden => 1 },
10 => { Name => 'ChurchillNav_0x000a', Format => 'double', Unknown => 1, Hidden => 1 },
11 => { Name => 'ChurchillNav_0x000b', Format => 'string', Unknown => 1, Hidden => 1 },
12 => { Name => 'ChurchillNav_0x000c', Format => 'double', Unknown => 1, Hidden => 1 },
13 => { Name => 'ChurchillNav_0x000d', Format => 'double', Unknown => 1, Hidden => 1 },
14 => { Name => 'ChurchillNav_0x000e', Format => 'double', Unknown => 1, Hidden => 1 },
16 => { Name => 'ChurchillNav_0x0010', Format => 'double', Unknown => 1, Hidden => 1 },
17 => { Name => 'ChurchillNav_0x0011', Format => 'double', Unknown => 1, Hidden => 1 },
18 => { Name => 'ChurchillNav_0x0012', Format => 'double', Unknown => 1, Hidden => 1 },
20 => { Name => 'ChurchillNav_0x0014', Format => 'double', Unknown => 1, Hidden => 1 },
);
%Image::ExifTool::MISB::Unknown = (
GROUPS => { 0 => 'MISB', 1 => 'MISB', 2 => 'Other' },
PROCESS_PROC => \&ProcessKLV,
NOTES => 'Other tags are extracted with the Unknown option.',
);
#------------------------------------------------------------------------------
# Process KLV (Key-Length-Value) metadata
# Inputs: 0) ExifTool ref, 1) dirInfo ref, 2) tag table ref
# Returns: 1 if anything was extracted
sub ProcessKLV($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirStart = $$dirInfo{DirStart};
my $dirEnd = $dirStart + $$dirInfo{DirLen};
my $rtnVal = 0;
my $pos;
$et->VerboseDir($$dirInfo{DirName}, undef, $$dirInfo{DirLen});
# loop through KLV packets
for ($pos=$dirStart; $pos<$dirEnd-1; ) {
my $tag = Get8u($dataPt, $pos++);
my $len = Get8u($dataPt, $pos++);
if ($len & 0x80) {
my $n = $len & 0x7f;
last if $pos + $n > $dirEnd;
$len = 0;
$len = $len * 256 + Get8u($dataPt, $pos++) foreach 1..$n;
}
last if $pos + $len > $dirEnd;
# best guess at decoding the value
my $val;
my $tagInfo = $$tagTablePtr{$tag} || { };
my $format = $$tagInfo{Format} || $defaultFormat{$len};
if ($format) {
$val = ReadValue($dataPt, $pos, $format, undef, $len);
} else {
# treat as string or binary data
$val = substr($$dataPt, $pos, $len);
if ($val !~ /^[\t\n\r\x20-\x7e]*$/) {
my $dat = $val;
$val = \$val;
}
}
$et->HandleTag($tagTablePtr, $tag, $val,
DataPt => $dataPt,
Start => $pos,
Size => $len,
);
$rtnVal = 1;
$pos += $len;
}
return $rtnVal;
}
#------------------------------------------------------------------------------
# Parse MISB metadata
# Inputs: 0) ExifTool ref, 1) data ref, 2) tag table ref
# Returns: 1 if something was extracted, 0 otherwise
sub ParseMISB($$$)
{
my ($et, $dataPt, $tagTablePtr) = @_;
my $end = length $$dataPt;
my $rtnVal = 0;
my $unknown = $$et{OPTIONS}{Unknown};
my $verbose = $$et{OPTIONS}{Verbose};
my $pos;
# increment document number in case we find any tags
$$et{DOC_NUM} = ++$$et{DOC_COUNT};
$$et{INDENT} .= '| ';
# skip the 5-byte header (ref 1 pg. 68)
# 0 - int8u: metadata service ID (0x00)
# 1 - int8u: sequence number (increments each packet)
# 2 - int8u: 0x0f (bits: cell fragmentation 00, decoder config 0, random access 0, reserved 1111)
# 3-4 - int16u: data length (ie. packet length - 5)
for ($pos = 5; $pos + 16 < $end; ) {
my $key = unpack('H*', substr($$dataPt, $pos, 16));
$pos += 16;
my $len = Get8u($dataPt, $pos);
++$pos;
if ($len & 0x80) { # is this a BER long form integer? (Basic Encoding Rules)
my $n = $len & 0x7f;
$len = 0;
return $rtnVal if $pos + $n > $end;
$len = $len * 256 + Get8u($dataPt, $pos++) foreach 1..$n;
}
my $tagInfo = $$tagTablePtr{$key};
unless ($tagInfo) {
if ($verbose or $unknown) {
# (assume this is a data set, but it maybe be a simple tag)
$tagInfo = { Name => "MISB_$key", SubDirectory => { TagTable => 'Image::ExifTool::MISB::Unknown' } };
$et->VPrint(0," [adding $$tagInfo{Name}]\n");
AddTagToTable($tagTablePtr, $key, $tagInfo);
} else {
# skip this record
$pos += $len;
next;
}
}
if ($pos + $len > $end) {
$len = $end - $pos;
$et->VPrint(0, "$$et{INDENT}(truncated record, only $len bytes available)\n");
}
my $dir = $$tagInfo{SubDirectory};
SetByteOrder($$dir{ByteOrder}) if $$dir{ByteOrder};
my %dirInfo = (
DataPt => $dataPt,
DirStart => $pos,
DirLen => $len,
DirName => $$tagInfo{Name},
);
ProcessKLV($et, \%dirInfo, GetTagTable($$dir{TagTable})) and $rtnVal = 1;
SetByteOrder('MM');
$pos += $len;
}
$$et{INDENT} = substr($$et{INDENT},0,-2);
delete $$et{DOC_NUM};
--$$et{DOC_COUNT} unless $rtnVal;
return $rtnVal;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::MISB - Read Motion Industry Standards Board metadata
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains code to extract STANAG-4609 Motion Industry Standards
Board (MISB) KLV-format metadata from M2TS videos.
=head1 AUTHOR
Copyright 2003-2023, Phil Harvey (philharvey66 at gmail.com)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 REFERENCES
=over 4
=item L<https://dokumen.tips/documents/nato-standardization-agreement-stanag-4609-ed-3.html>
=item L<https://upload.wikimedia.org/wikipedia/commons/1/19/MISB_Standard_0601.pdf>
=item L<https://dokumen.tips/documents/misb-st-010211-standard-security-metadata-universal-standard-describes-the-use.html>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/MISB Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
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